1.10.2 Handling and Static Discharge Precautions
After unpacking and prior to system integration, the drive can be exposed
to
potential handling and ESD hazards. It is mandatory that you observe
proper static-discharge precautions and
handle the drive by the frame
only.
1.11
110
Cable Requirements
1.11.1
Cable
A SO-conductor flat cable or 25-conductor twisted pair cable is required.
The maximum
cable length is 6 meters (19.7
ft).
Each SCSI bus connec-
tion may have a
10 cm (3.9 in) maximum stub length.
The characteristic impedance for unshielded flat or twisted pair ribbon
cable should be 100 n ±10%. A characteristic impedance greater than
90 n is preferred for shielded cables. To minimize discontinuities and
signal reflections it is desirable to minimize the use of cables of different
impedances in the same bus.
Figure
3:
50
Pin
SCSI
Connector
Pin
Assignments
Signal
-08(0)
-08(1)
-08(2)
-08(3)
-06(4)
-06(5)
-06(6)
-06(7)
-06(P)
Ground
Ground
Ground
Terminator Power
Pin Num.
2
4
6
8
10
12
14
16
18
20
22
24
26
Signal
Ground
Ground
-ATN
Ground
-6SY
-ACK
-RST
-MSG
-SEL
-CID
-REQ
-1/0
Pin Num.
28
30
32
34
36
38
40
42
44
46
48
50
Note:
All odd pins, except pin-25 are connected to ground. Pin-25 is not
connected.
10 ST125N/138N/157N Product Manual, Rev. C
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